剩余的脂蛋白通过对氧化还原敏感机制诱导内皮细胞中的益热血原分子
H Doi1, K Kugiyama, H Oka
1Department of Cardiovascular Medicine, Kumamoto University School of Medicine, Kumamoto City, Japan.
Circulation
|August 10, 2000
概括
类似残留性脂蛋白颗粒 (RLPs) 增加了内皮细胞中益风性分子的表达,部分是通过氧化应激. 抗氧化剂治疗减少了这些影响,这表明RLP有助于过高甘油三血症中的动脉血症.
科学领域:
- 心血管生物学 心血管生物学
- 脂质代谢 脂质代谢是什么
- 内皮细胞功能 内皮细胞功能
背景情况:
- 富含三糖蛋白脂蛋白 (TGLs) 涉及动脉样硬化,但其细胞效应尚未完全理解.
- 内皮功能障碍是动脉生成的一个关键早期事件.
- 细胞间粘附分子-1 (ICAM-1),血管细胞粘附分子-1 (VCAM-1) 和组织因子 (TF) 是由内皮细胞表达的益血栓分子.
研究的目的:
- 研究孤立的残留样脂蛋白颗粒 (RLP) 对ICAM-1,VCAM-1和TF的内皮表达的影响.
- 阐明RLP诱导的内皮细胞激活背后的细胞机制.
- 探索氧化应激在RLP中介作用中的作用.
主要方法:
- 通过免疫亲和染色法从高甘油三血症患者的血中分离RLP.
- 培养的人体内皮细胞与RLP,总TGL和LDL的化.
- 对ICAM-1,VCAM-1和TF的mRNA和蛋白质表达的测量.
- 使用氧化剂敏感探针评估细胞内氧化剂水平.
- 对RLP诱导的变化对抗氧化作用 (α-托科菲罗尔,N-乙半氨酸) 的评估.
- 血RLP水平与患者溶性粘附分子水平的相关性.
- 评估对溶性粘附分子和RLP氧化抵抗的α-托科菲罗尔治疗效应.
主要成果:
- 随着RLP的化,内皮ICAM-1,VCM-1,TF mRNA和蛋白质的表达显著上调.
- 与RLP相比,总TGL和LDL的效果很小.
- RLPs增加了细胞内氧化剂水平.
- 抗氧化剂阿尔法-托科菲罗尔和N-乙半氨酸抑制了RLP诱导的这些分子的上调.
- 较高的血RLP水平与较高的可溶性血ICAM-1和VCAM-1水平相关.
- 阿尔法托科菲罗尔治疗减少了可溶性粘附分子,并增加了RLP的氧化抵抗.
结论:
- 通过对氧化回归敏感的途径,RLP促进了前血栓分子 (ICAM-1,VCAM-1,TF) 的内皮表达.
- 在过高甘油血症患者观察到的动脉血症并发症中,RLP可能起着重要作用.
- 针对氧化应激可能是针对RLP相关心血管风险的治疗策略.
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